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By pexpipeman, 10/11/2012

Heat exchangers of this type consist of a number of series-connected units. Each link consists of two coaxial tubes. For easy cleaning and replacement of the inner tubes are usually interconnected. Double-tube heat exchangers with significant heating surface consists of a number of sections, parallel-connected manifolds. If one of the coolant is saturated steam, it is usually sent to the annular (ring) space. These heat exchangers are often used as a liquid or gas-liquid. Selection of the inner and outer diameters of the tubes can be provided to both the working environment, participating in the heat transfer, the necessary speed to achieve a high heat transfer rate.

Advantages of double pipe heat exchanger: a high heat transfer coefficient, suitable for heating or cooling media at high pressure, ease of fabrication, installation and maintenance.
Disadvantages twin tube heat exchanger – bulky, high cost due to the large consumption of metal on the outer tube, are not involved in the heat exchange, the complexity of cleaning the annulus.

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By pexpipeman, 12/16/2011

Heat exchangers are the sub devices used for exchanging the heat, as its names suggests. It transfers the heat efficiently from one medium to another. Heat exchangers are generally used in all the devices which can control temperature and humidity of a proper volume space. For example, these are used in chemical and power plants, natural gas processing, in refrigeration, air conditioning or you can say in HVAC industries.

There are many types of heat exchangers depending upon the shells, tubes, wheels, plates and fluid used in them. Few of them are:

Adiabatic wheel type: This type of heat exchanger uses a transitional fluid or solid to store the heat and has the capability of absorbing the heat. Further, the heat stored in transitional state’s fluid or solid moves to the other side of heat exchanger for releasing it.
Examples: Cold fluid adiabatic wheels heat exchangers have a large wheel that consists of threads and these fine threads are rotated by heat.

Plate fin type:  This type of exchangers has the passages which are sandwiched in between. And passages consist of fins. These fins are responsible for more efficiency. The fins have several shapes like offset fin, wavy fins and straight fins.

The fins and plates need to have higher heat transfer rate, so they are made up of metal alloys such as aluminum which makes them more effective.
High heat transmission, resisting extreme pressure, huge amount of heat transfer and lighter in weight are a few advantages of plate fin type heat exchangers.

Shell and tube: This type of heat exchangers contains sequences of PEX tubes or pipe like bodies.  And these tubes are filled with fluid which acts as heat transferring medium. The other tubes used in this may have some different fluid. The second fluid surrounds the tubes which are facing the thermal conditions such as cooling or heating.

Main advantage of this type of heat exchangers is that they can resist very high pressure, around or more than 30 bars. The shape of this heat exchanger is also responsible for resisting high pressure.

Plate type: This is further divided into categories depending upon the number of plates and their gaps between each other. Plate type heat exchangers are used widely in HVAC applications. These are also called as Plate and Frame type heat exchangers. The plate’s arrangements such as number of plates and gap in between them are interrelated with the efficiency of heat absorbing and transferring.

Fluid type: This is the most widely used type of heat exchangers. These are more economical than others. Espresso machines are the most common, which use this type of heat exchangers. In fluid heat exchanger’s process, two simultaneously process are held which improves its working efficiency.

Spiral type: As the name suggests, the shape of these types of heat exchangers is spiral or helical because they look like coils and have different sheets. Whole heat exchanger is divided into channels in which few channels act as reservoir of fluid which exchanges the heat.

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By pexpipeman, 06/03/2011

With regard to their considerable task, heat exchangers are commonly utilized in many domains presently. Consequently, one may find them in the compound sector, the vehicle engineering area, the healthcare area and even in gas and propane refineries. Two of the most prevalent types of heat exchangers uses can be located just about everywhere these days. Persons pass by them every day going to work or back home and a plethora of individuals operate them rigorously. Those appliances in subject are the air conditioning units along with the car radiators. These are generally those heat exchangers that are utilized for the comfort of regular people, but there are also brands that may only be utilized in industries and specialty domains.

In the present day, the humans are encompassed by gadgets which use their propriety to switch heat from one item to a different one in order to make living more comfortable. Regardless of this surprising selection of heat exchangers encircling everyone, few sit to think about what exactly these devices are and what they do. The main function of these objects is to switch the temperature from one object, liquid, surface to another, through the technique of a media. These media can be a solid shape between the two mediums or a fictive section that really allows the two mediums to touch.

Regarding the area where the heat exchangers are used, there are a series of types that are of the top importance. There are the fluid-to-fluid exchangers that transfer the temperature from one medium to a different one, and the substances are segregated by a solid media. An additional category is the fluid-to-air exchangers, and they exchange the warmth from fluids to the air in a space. The ideal model for this form of heat exchangers is the standard radiator most people install within their dwellings to maintain them warm during winter time.

http://www.pexuniverse.com/brazetek-water-to-air-heat-exchangers

For heat exchanger sizing and quotes information

Heat Exchanger Manufacturer

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By pexpipeman, 04/28/2011

The plate and frame heat exchanger has some detail sheets and  ribbed sheets that are perched in a carbon steel frame. There are dishes balanced from the top drive and attached to the bottom of the bar. A weld encloses the liquid conduits that part the liquids in the device. Covers surround the entire heat exchanger unit.

Plate and frame heat exchangers are widely used in industrialized processes, such as food processing, chemicals, nuclear deposits and industrial refrigeration processes. For example, they used to chill the hydraulic oil in sulfuric acid manufacturing metal. It is also used in copper mines and for extremely sticky substances, such as eggs, sauces, honey, or starches, in food processing.

Heat exchangers are necessary and frequently used in heat and electricity, air conditioning and refrigeration, heat recovery, transport and manufacturing industries. This equipment is also noteworthy in electronic cooling and environmental issues such as thermal pollution, waste disposal and sustainable development.

Plate heat exchangers are available in a variety of metal alloys handle highly corrosive liquids. The expansion and addition of services in one easy, because the building. Because of the heat transfer coefficients higher, the space is less than the peel and-tube unit, which reduces the cost of plant construction.

Gaskets that connect the disks are the main weakness of this heat exchanger’s frame. Depending on the speed of the fluid and corrosion, seals can begin to lose, after a period, after the downtime that require maintenance and replacement. Pressure drop in the heat exchanger is high, and this may require the purchase and operating costs and more efficient pumping system. Although the maintenance is easier for a plate heat exchanger, it can still become clogged. This leads to long periods of inactivity.

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By pexpipeman, 04/08/2011

Brewing your own beer in the comfort of your back yard has been a part of the American Dream for decades. Nowadays more and more people choose homemade beer over factory beer, not only because of its better taste, but also for the satisfaction they get when producing it at home.

An essential part of brewing is using a chilling device made of copper wort chillers. Using such a heat exchanger is essential in the process of making beer because it helps keep the alcohol levels within normal limits in order to get the right taste.

The heat exchangers used here will most likely be brazed plate heat exchangers. This is a water to water type of heat exchanger that maintains the temperature of the wort at the best possible level. A beer and wort plate chiller also guarantees that the boiling wort is cooled in the right amount of time so that the beer does not lose its flavor.

Boiling is the most important part in brewing the beer. It determines the color and aroma of the magic liquid, so if you are really looking for your friends’ admiration, this is the one step with which you need to be extra careful. Keep in mind that the hot wort must be cooled as soon as possible. It needs to be brought down to a temperature that favors the growth of yeast. If the temperature is too high, the yeast will die off. If it is too cold, the yeast will be rendered inactive.

As a final point, using a heat exchanger in the brewing process is not only highly recommended but also essential to obtaining a tasty, flavored beer that will impress even the most experienced brewers. So get your necessary equipments and start brewing today!